/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.curator.utils;
import org.apache.zookeeper.
ZooKeeper;
import org.slf4j.
LoggerFactory;
/**
* Utils to help with ZK 3.4.x compatibility
*/
public class
Compatibility
{
private static final boolean
hasZooKeeperAdmin;
static
{
boolean
hasIt;
try
{
Class.
forName("org.apache.zookeeper.admin.ZooKeeperAdmin");
hasIt = true;
}
catch (
ClassNotFoundException e )
{
hasIt = false;
LoggerFactory.
getLogger(
Compatibility.class).
info("Running in ZooKeeper 3.4.x compatibility mode");
}
hasZooKeeperAdmin =
hasIt;
}
/**
* Return true if the classpath ZooKeeper library is 3.4.x
*
* @return true/false
*/
public static boolean
isZK34()
{
return !
hasZooKeeperAdmin;
}
/**
* For ZooKeeper 3.5.x, use the supported <code>zooKeeper.getTestable().injectSessionExpiration()</code>.
* For ZooKeeper 3.4.x do the equivalent via reflection
*
* @param zooKeeper client
*/
public static void
injectSessionExpiration(
ZooKeeper zooKeeper)
{
if (
isZK34() )
{
InjectSessionExpiration.
injectSessionExpiration(
zooKeeper);
}
else
{
// LOL - this method was proposed by me (JZ) in 2013 for totally unrelated reasons
// it got added to ZK 3.5 and now does exactly what we need
// https://issues.apache.org/jira/browse/ZOOKEEPER-1730
zooKeeper.
getTestable().
injectSessionExpiration();
}
}
}